The Rehab singer, up for two Brit awards, says: "My drinking replaced weed. I still have a problem. I have had a problem with drink but I haven't had a drink in a few days.

"The problem isn't exaggerated. I'm a terrible drunk. I don't know where that comes from - boredom?" But Amy, 23, denies she has an eating disorder. She says she hit the gym after ditching cannabis - and shifted too many pounds.

The skinny singer, right, who slimmed to a scrawny size 6 at one point, explains: "I'd get up, smoke two big spliffs then think I should eat something so I'd have a fry-up.

"Then I wouldn't eat anything all day. Then I'd eat pasta at two in the morning.

"I can't smoke now because my energy crashes.

"I'm a gym girl. I'm not a lazy person anymore. I'd train every day if I had the chance.".